package org.apache.solr.handler;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import org.apache.solr.common.SolrException;
import org.apache.solr.common.params.SolrParams;
import org.apache.solr.common.util.ContentStream;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.response.SolrQueryResponse;
import org.apache.solr.update.processor.UpdateRequestProcessor;
import org.apache.solr.update.processor.UpdateRequestProcessorChain;
import org.apache.solr.util.SolrPluginUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Shares common code between various handlers that manipulate
 * {@link org.apache.solr.common.util.ContentStream} objects.
 * 
 **/
public abstract class ContentStreamHandlerBase extends RequestHandlerBase {
	public static Logger log = LoggerFactory
			.getLogger(XmlUpdateRequestHandler.class);

	@Override
	public void handleRequestBody(SolrQueryRequest req, SolrQueryResponse rsp)
			throws Exception {
		SolrParams params = req.getParams();
		UpdateRequestProcessorChain processorChain = req.getCore()
				.getUpdateProcessingChain(
						SolrPluginUtils.resolveUpdateChainParam(params, log));

		UpdateRequestProcessor processor = processorChain.createProcessor(req,
				rsp);

		try {
			ContentStreamLoader documentLoader = newLoader(req, processor);

			Iterable<ContentStream> streams = req.getContentStreams();
			if (streams == null) {
				if (!RequestHandlerUtils.handleCommit(processor, params, false)
						&& !RequestHandlerUtils.handleRollback(processor,
								params, false)) {
					throw new SolrException(
							SolrException.ErrorCode.BAD_REQUEST,
							"missing content stream");
				}
			} else {

				for (ContentStream stream : streams) {
					documentLoader.load(req, rsp, stream);
				}

				// Perhaps commit from the parameters
				RequestHandlerUtils.handleCommit(processor, params, false);
				RequestHandlerUtils.handleRollback(processor, params, false);
			}
		} finally {
			// finish the request
			processor.finish();
		}
	}

	protected abstract ContentStreamLoader newLoader(SolrQueryRequest req,
			UpdateRequestProcessor processor);
}
